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// Copyright (c) 2010 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "chrome/browser/sync/util/cryptographer.h"
namespace browser_sync {
const char kNigoriTag[] = "google_chrome_nigori";
// We name a particular Nigori instance (ie. a triplet consisting of a hostname,
// a username, and a password) by calling Permute on this string. Since the
// output of Permute is always the same for a given triplet, clients will always
// assign the same name to a particular triplet.
const char kNigoriKeyName[] = "nigori-key";
Cryptographer::Cryptographer() : default_nigori_(NULL) {
}
bool Cryptographer::CanDecrypt(const sync_pb::EncryptedData& data) const {
return nigoris_.end() != nigoris_.find(data.key_name());
}
bool Cryptographer::Encrypt(const ::google::protobuf::MessageLite& message,
sync_pb::EncryptedData* encrypted) const {
DCHECK(encrypted);
DCHECK(default_nigori_);
std::string serialized;
if (!message.SerializeToString(&serialized)) {
NOTREACHED(); // |message| is invalid/missing a required field.
return false;
}
encrypted->set_key_name(default_nigori_->first);
if (!default_nigori_->second->Encrypt(serialized,
encrypted->mutable_blob())) {
NOTREACHED(); // Encrypt should not fail.
return false;
}
return true;
}
bool Cryptographer::Decrypt(const sync_pb::EncryptedData& encrypted,
::google::protobuf::MessageLite* message) const {
DCHECK(message);
NigoriMap::const_iterator it = nigoris_.find(encrypted.key_name());
if (nigoris_.end() == it) {
NOTREACHED() << "Cannot decrypt message";
return false; // Caller should have called CanDecrypt(encrypt).
}
std::string plaintext;
if (!it->second->Decrypt(encrypted.blob(), &plaintext)) {
return false;
}
return message->ParseFromString(plaintext);
}
bool Cryptographer::GetKeys(sync_pb::EncryptedData* encrypted) const {
DCHECK(encrypted);
DCHECK(!nigoris_.empty());
// Create a bag of all the Nigori parameters we know about.
sync_pb::NigoriKeyBag bag;
for (NigoriMap::const_iterator it = nigoris_.begin(); it != nigoris_.end();
++it) {
const Nigori& nigori = *it->second;
sync_pb::NigoriKey* key = bag.add_key();
key->set_name(it->first);
key->set_hostname(nigori.hostname());
key->set_username(nigori.username());
key->set_password(nigori.password());
}
// Encrypt the bag with the default Nigori.
return Encrypt(bag, encrypted);
}
bool Cryptographer::AddKey(const KeyParams& params) {
DCHECK(NULL == pending_keys_.get());
// Create the new Nigori and make it the default encryptor.
scoped_ptr<Nigori> nigori(new Nigori(params.hostname));
if (!nigori->Init(params.username, params.password)) {
NOTREACHED(); // Invalid username or password.
return false;
}
std::string name;
if (!nigori->Permute(Nigori::Password, kNigoriKeyName, &name)) {
NOTREACHED();
return false;
}
nigoris_[name] = make_linked_ptr(nigori.release());
default_nigori_ = &*nigoris_.find(name);
return true;
}
bool Cryptographer::SetKeys(const sync_pb::EncryptedData& encrypted) {
DCHECK(CanDecrypt(encrypted));
sync_pb::NigoriKeyBag bag;
if (!Decrypt(encrypted, &bag)) {
return false;
}
InstallKeys(encrypted.key_name(), bag);
return true;
}
void Cryptographer::SetPendingKeys(const sync_pb::EncryptedData& encrypted) {
DCHECK(!CanDecrypt(encrypted));
pending_keys_.reset(new sync_pb::EncryptedData(encrypted));
}
bool Cryptographer::DecryptPendingKeys(const KeyParams& params) {
Nigori nigori(params.hostname);
if (!nigori.Init(params.username, params.password)) {
NOTREACHED();
return false;
}
std::string plaintext;
if (!nigori.Decrypt(pending_keys_->blob(), &plaintext))
return false;
sync_pb::NigoriKeyBag bag;
if (!bag.ParseFromString(plaintext)) {
NOTREACHED();
return false;
}
InstallKeys(pending_keys_->key_name(), bag);
pending_keys_.reset();
return true;
}
void Cryptographer::InstallKeys(const std::string& default_key_name,
const sync_pb::NigoriKeyBag& bag) {
int key_size = bag.key_size();
for (int i = 0; i < key_size; ++i) {
const sync_pb::NigoriKey key = bag.key(i);
// Only use this key if we don't already know about it.
if (nigoris_.end() == nigoris_.find(key.name())) {
scoped_ptr<Nigori> new_nigori(new Nigori(key.hostname()));
if (!new_nigori->Init(key.username(), key.password())) {
NOTREACHED();
continue;
}
nigoris_[key.name()] = make_linked_ptr(new_nigori.release());
}
}
DCHECK(nigoris_.end() != nigoris_.find(default_key_name));
default_nigori_ = &*nigoris_.find(default_key_name);
}
} // namespace browser_sync
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